Latency Art: X marks the spot

Here is another example of latency art (interesting I/O latency heat maps). This is a screenshot from Analytics on the Sun Storage 7000 series. The configuration was 2 JBODs (48 disks) configured with mirroring, and a single NFS client performing a synchronous write workload (opened with O_DSYNC), from one thread writing 8 Kbyte I/O sequentially. [...]

Posted on June 12, 2009 at 4:32 pm by Brendan Gregg · Permalink · 2 Comments
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Latency Art: Rainbow Pterodactyl

In previous posts I’ve demonstrated Analytics from the Sun Storage 7000 series, which is a DTrace based observability tool created by Bryan. One of the great features of Analytics is its use of heat maps, especially for I/O latency. I/O latency is the time to service and respond to an I/O request, and since clients [...]

Posted on March 12, 2009 at 8:12 pm by Brendan Gregg · Permalink · 4 Comments
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